Open AccessWinners and losers over 35 years of dragonfly and damselfly distributional change in Germany
Author(s) -
Bowler Diana E.,
Eichenberg David,
Conze KlausJürgen,
Suhling Frank,
Baumann Kathrin,
Benken Theodor,
Bönsel André,
Bittner Torsten,
Drews Arne,
Günther André,
Isaac Nick J.B.,
Petzold Falk,
Seyring Marcel,
Spengler Torsten,
Trockur Bernd,
Willigalla Christoph,
Bruelheide Helge,
Jansen Florian,
Bonn Aletta
Publication year - 2021
Publication title -
diversity and distributions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.918
H-Index - 118
eISSN - 1472-4642
pISSN - 1366-9516
DOI - 10.1111/ddi.13274
Subject(s) - odonata , damselfly , dragonfly , ecology , occupancy , species richness , habitat , species distribution , geography , biodiversity , taxon , global biodiversity , biology
Abstract Aim Recent studies suggest insect declines in parts of Europe; however, the generality of these trends across different taxa and regions remains unclear. Standardized data are not available to assess large‐scale, long‐term changes for most insect groups but opportunistic citizen science data are widespread for some. Here, we took advantage of citizen science data to investigate distributional changes of Odonata. Location Germany. Methods We compiled over 1 million occurrence records from different regional databases. We used occupancy‐detection models to account for imperfect detection and estimate annual distributions for each species during 1980–2016 within 5 × 5 km quadrants. We also compiled data on species attributes that were hypothesized to affect species’ sensitivity to different drivers and related them to the changes in species’ distributions. We further developed a novel approach to cluster groups of species with similar patterns of distributional change to represent multispecies indicators. Results More species increased (45%) than decreased (29%) or remained stable (26%) in their distribution (i.e. number of occupied quadrants). Species showing increases were generally warm‐adapted species and/or running water species, while species showing decreases were cold‐adapted species using standing water habitats such as bogs. Time series clustering defined five main patterns of change—each associated with a specific combination of species attributes, and confirming the key roles of species’ temperature and habitat preferences. Overall, our analysis predicted that mean quadrant‐level species richness has increased over most of the time period. Main conclusions Trends in Odonata provide mixed news—improved water quality, coupled with positive impacts of climate change, could explain the positive trends of many species. At the same time, declining species point to conservation challenges associated with habitat loss and degradation. Our study demonstrates the great value of citizen science and the work of natural history societies for assessing large‐scale distributional change.